I've heard douglas fir works well as a soundboard, but is more prone to splitting with humidity and temperature changes. Never used it myself though....
I messaged the seller in German to ask what the thing in the soundholes were and they replied that they were 'like loudspeakers' and the left one was...
I'm afraid I closed the tab now and can't find it again, but in the listing I found it said in the description "made in 1994". Maybe they just meant...
My thought too. I was going to title this thread calling it a harp-mandriola, as per the listing, but then thought it'd need those open strings to be...